Fleas are one to the most important groups of insect pests because they not only cause discomfort by biting, but they can transmit several diseases such as plague and murine typhus. Color brownish black to black, but reddish black when full of blood. It is not necessary to have pets in the building in order to have fleas present.
Since fleas can jump about 6” (15 cm) vertically, they can easily hitch a ride on shoes, trousers, etc. Many vacationers who may have been unaware of the few adult fleas present, are often greeted and severely attacked by fleas upon their return. This can occur even if the building has been vacant of animals and people for as long as 6 months or so.